#6399BE
Closest named color: Faded Blue (#658CBB). oklch(66% 0.08 239.5), rgb(99, 153, 190).
Aa
Black text reads best on this color (6.83:1).
About this color
#6399BE is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.080 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.036 away. Black text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.83:1 |
| White text | 3.07:1 |
Values
| HEX | #6399BE |
| RGB | rgb(99, 153, 190) |
| HSL | hsl(204, 41%, 57%) |
| OKLCH | oklch(66% 0.08 239.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #6399BE | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #6399BE | 6.83:1 | AA | Lc 46.5 | Large or bold text, headings |
| #6399BE text on white | 3.07:1 | AA large text | Lc 57.5 | Large or bold text, headings |
| #6399BE text on black | 6.83:1 | AA | Lc -44.2 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC5D8
oklch(81% 0.039 239.7)
-
Step 400
400
#7DA6C4
oklch(70.6% 0.063 240.5)
-
Step 500
500 (this color)
#6399BE
oklch(66% 0.08 239.5)
-
Step 600
600
#3F7AA1
oklch(55.7% 0.087 239.8)
-
Step 700
700
#30678A
oklch(49.2% 0.081 239.3)
-
Step 800
800
#295470
oklch(42.8% 0.067 239.5)
-
Step 900
900
#26455A
oklch(37.6% 0.052 239.7)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#6399BE with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #8998C0 | 0.046 |
| Deuteranopia (no green cones) | #7C8FBD | 0.037 |
| Tritanopia (no blue cones) | #38A2A5 | 0.064 |
| Achromatopsia (no color) | #939393 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399BE
#6399BE
oklch(66% 0.08 239.5)
- #B78660
#B78660
oklch(65.9% 0.08 58.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #6399BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.036
- Greyblue #77A1B5 ΔE 0.038
- Silver Lake Blue #778DA9 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.046
- Cadet Blue #5F9EA0 ΔE 0.053
- Cool Gray #8D99AE ΔE 0.054
- Bluey Grey #89A0B0 ΔE 0.056
- Bluegrey #85A3B2 ΔE 0.056
Use #6399BE in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.